Words that contain 'ri' and end in 'r'

Which word in particular on this page consists the highest number of letters?
The word 'auriculoventricular' has 19 characters.

What is an interesting word from all the word combos available ?
You'll note a handful of weird words in this list, however our favorite word at the moment is 'grinder'. The definition of 'grinder' is as follows: "1. One who, or that which, grinds. 2. One of the double teeth, used to grind or masticate the food; a molar. 3. (Zoöl.) The restless flycatcher (Seisura inquieta) of Australia; -- called also restless thrush and volatile thrush. It makes a noise like a scissors grinder, to which...".

Which word that has 'ri' in and ends with 'r' is the most popular word?
There's 'river', which ranks as the 637^th most popular word.

What is the highest scoring word you can play in Scrabble ?
With the massive number of words to select from, you'll want to try 'frizzier' which scores 29 points.

What's the maximum number of words one can construct from this list?
There are 1,180 words in total.